package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.io.IOUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {
    @Value("${reggie.path}")
    private String basePath;

    /**
     * 文件上传
     *
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {
        log.info(file.toString());
//原始文件名
        String originalFilename = file.getOriginalFilename();
        String substring = originalFilename.substring(originalFilename.lastIndexOf("."));
//使用UUid重新生产文件名.防止文件名重复发生覆盖的问题
        String fileName = UUID.randomUUID().toString() + substring;
//创建一个目录对象
        File dir = new File(basePath);
        //判断目录对象是否存在
        if (!dir.exists()) {
            //如果不存在.就创建一个
            dir.mkdirs();
        }

        try {
            //动态的将临时文件转存到指定路径
            file.transferTo(new File(basePath + fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);

    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) {
        try {
            //输入流,通过输入流读取文件内容
            FileInputStream fis = new FileInputStream(new File(basePath + name));
            //输出流,通过输出流文件写回浏览器
            ServletOutputStream sos = response.getOutputStream();
            //  response.setContentType("image/jpeg");
            IOUtils.copy(fis, sos);
            //关闭资源
            fis.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
